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Speaking of hard science fiction (and Hal Clement) - One of my favorite hard sci-fi stories is a short story by Hal Clement; I can't remember the name but it's in a collection of his stories. We tend to think of "hard" sci-fi as being in the future, but this story is about a man in ancient rome figuring out a method (with locally available means and technology) to give his son a blood transfusion. Some great stuff, and outside the "norm" for science fiction.
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